/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/PBDJointConstraints.h
Set the break callback. This will be called once after the constraint solver phase on the \ tick when the constraint is broken. There is only one callback allowed - it is usually a method on the owner (e.g., the Evolution object) which will probably dispatch its own event.
void SetBreakCallback ( const [FJointBreakCallback](API\Runtime\Chaos\Chaos\FJointBreakCallback) & Callback )